英语所有时态和讲解答:现在完成时可与just, before, now, today, this morning, until(till, up to) now, so far, in the past(last) few years, all day, since 1990, for a long time, recently, lately, always, often, sometimes, ever, never, once, three times, how long等时间状语连用。但不可与yesterday, last...